Mining machine



T. E. PRAY MINING MACHINE May 9, 1933,

Original Filed Oct. 6, 1930 4 Sheets-Sheet 1 #7530210? 72011144 Z: My W3 T. E. PRAY 1,908,179

MINING MACHINE Original Filed Oct. 6, 1930 4 Sheets-Sheet 2 M to, 1 7200%?- T/ a ,xwwwwumox May 9, 1933.

N L r/ $1, MUG

M51719, 1933. T. E. PRAY 1,908,179

MINING MACHINE Original Filed Oct. 6, 1950 4 Sheets-Sheet 3 @QM M T. E. PRAY MINING MACHINE May 9, 1933.

Original FIled Oct. 6, 1930 4 Sheets-Sheet 4 Patented May 9, 1933 UNITED STATES PATENT OFFl-rCE THOMAS E. PRAY, OF CHICAGO, ILLINOIS, ASSIGNOR TO GOODMAN MANUFACTURING COMPANY,- OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS iii MINING ACHINE Application filed October 6, 1930, Serial No. 486,549; Renewed January 18, 1332. i

invention relates to improvements in mining machines and more particularly to a track mounted mlnlng machme adapted to ous elevations with respect thereto.

' shown in Figure 1 with certain parts broken away and in section;

Figure 3 is a partial enlarged sectional view taken on line 3-3 of Figure 1;

Figure 4 is a partial enlarged sectional view taken on line i4 of Figure 1;

Figure 5 is an enlarged fragmentary slde elevation of the forward portion of the machine with parts broken away and in section;

Figure 6 is a sectional view taken on line 6 6 of Figure 5;

Figure 7 is a partial enlarged top plan view of the forward portion of the machine Q with the cutting element broken away and with parts shown in section;

Figure 8 is a sectional view taken on line 88 of Figure 3; and

Figures 9, 10, 11, 12 and 13 are diagrammatic views showing the mining machine in various positions during the cutting operation.

Like numerals refer to like parts throughout the several figures.

Referring now in particular to the drawings, the device embodying my invention is shown as a mining machine of the straightface type similar to that disclosed in Patent Number 1,244,178, issued to Charles-E. Davis, October 23, 1917, but differs therefrom in that a wider range of movement of the cutting element isprovided than is shown in the Davis patent so that the machine may cut in narrow places equally as well as in wide places and so the machine may cut a kerf below the level of the track in front of and to each side of the track.

As illustrated in the drawings, the machine is made up of four general'elements oom prising a base frame 1 ,a feeding frame 2, a pivotal frame 3 mounted thereon for-pivotal movement with respect thereto about a vertica-l axis adjacent the forward end of the feeding'frame 2, and a cutting element 4 carried -on the pivotal frame 3.

The base frame 1 is preferably mounted upframe 3 is mounted on a stud 5 on the forward 1 portion of the feeding frame 2 for pivotal movement with respect thereto. The-cutting 7 element 4 is trunnioned on the pivotal frame 3 beyond the forward end thereof on trunnion supports 6, 6 and is yieldably supported at its rearward end by an adjusting screw 7 for adjusting the angle of said cutting element with respect to the pivotal frame 3.

Referring now in particular to the details of the feeding frame 2 and means for fecding the cutting element 4 to cut a substantially straight face in the mine wall, a motor 10 is mounted on the rear end of the feeding frame 2 and is operatively connected with a transverse shaft 11 by means of a suitable gear train generally indicated at 12. A spur gear 13 is on the opposite end of the transverse shaft 11 from the motor 10 and meshes with and drives a spur gear '14 on a transone slot to the other.

verse shaft 15. A suitable gear train generally indicated at 16 drives parallel spaced transverse shafts 17 and 18 from the transverse shaft 15, the shaft 18 being above the shaft 17. A worm and worm gear drive 20 has connection with the shaft 18 and a vertical shaft 21 for driving said shaft 'from the shaft 18. A spur gear 22 is keyed on the lower end of the shaft 21 and meshes with a circular rack 23 on the rearward portion of the base frame 1. Suitable means are provided for controlling the connection of the worm and worm gear drive 20 to the shaft 18 so said Worm and worm gear drive may be selectively connected thereto, which means herein comprise a suitable clutch means of an ordinary construction generally indicat ed at 24.

A movable connecting device 25 is pivot- .ally connected with the base frame 1 on a The feeding frame 2 is provided with a pivot 29 which has a sliding pivotal connection with the base frame 1 in slots 30 and 31 in the base frame 1. The slots 30 and 31 have their forward ends on the outer forward corners of the base frame 1 and con- T verge towards the central portion of said base which slides in the slots 30 and 31 and engages. recesses 33 in the slots 30 and 31 as shown in Figures 3 and 5 so as to prevent the feeding frame 2 from being lift-ed upwardly to disengage it from the base frame 1. Thus as the feeding frame 2 is rocked with respect to the base frame 1 and movable connecting device 25 by means of the spur gear 22 andrack 23, the pivot 29 passes along one slot and is switched to the. other at the center of the base frame 1.

Suitable switching means are provided which consist of a switching cam 34 connected with the feeding frame back of the pivot. 29 at the point where the slots 30 and 31 meet. At the meeting point of the converging slots there are rearwardly projecting engagingfaces 38 and 39. As the pivot 29 reaches this central position, the further rocking movement of the moving frame causes the switching cam 34 to engage one of these faces and switches the pivot 29 from For example, if the pivot 29 is moving along slot 30 toward the center, when it reaches the center where the two slots meet, the switching cam 34 engages V the face 39. At this point the moving frame. has reached the limit of its backward movement and then begins to move forward and the engagement of the switching cam 34 with the face 39 causes the pivot 29 to be moved to pass into the slot 31. If the pivot 29 is moved in the opposite direction, that is, in the slot 31 and is moving towards the center, when it reaches the center the switching cam 34 engages the face 38 and switches said pivot into the slot 30.

Suitablemeans are provided to clear the cuttings from the slots 30 and 31 during the cutting'operation, which means herein comprise a cleaner 41 placed ahead of the pivot 29. This cleaner has two projecting arms 42 as shown, the ends of which pass along the faces of the slots 30 and 31, and is pivotally mounted upon the pivot 29. This cleaner has connected with it a part 43 provided with lugs 44 adapted to engage a pin 45 so as to limit movement of the cleaner, (see Figs. 7 and 8). The cleaner 41 is provided with a projection 46 which is engaged by a controlling device47, mounted upon a pin 48 which is interposed between the removable holding piece 32 and the feeding frame 2. This controlling device is provided with projecting parts 49 and as the pivot 29 passes from one ofthe slots 30 or 31 tothe other, one of these projecting parts engages a point 50 at the point where the slots 30 and 31 come together and causes the cleaner 41 to, be moved so that it extends directly across the slot into which it is then to be moved and thus guides said cleaner into said slot and moves ahead of the pivot 29 so as to clear the respective slot, in which the pivot 29 is moving, ofcuttings, dirt, or other material that may be therein.

Referring now in particular to the details l of the cutting element 4- and means for moving said cutting element and pivotal frame 3 about the axis of the stud 5, said cutting element is provided with a motor 52 herein preferably shown as an electric motor at the rearward end thereof, and cutting mechanism forwardly of said motor. The cutting mechanism is of a usual construction so will only be described insofar as is necessary to clearly set forth my invention.

A portion 53 of the cutting element 4 projects forwardly beyond the base frame 1 and has a pair of guides 54 depending therefrom on each side of the longitudinal center line of said cutting element. A cutter head 55 is provided with guides 56 which are adapted. to register with the guides 54 and is movable in said guides towards and away from the portion 53 of the cutting element 4. A cutter bar 57 projects forwardly from the cutter head 55 and has a cutter chain 58 movable thereabout. The cutter chain 58 is driven from a sprocket 59 fixed on a sleeve 60 journaled within the cutter head 55 and driven from the motor 52 by means of a splined shaft 61 interposed between said ensa-'29 sleeve and the portion '53 of the cuttin-gel'e'- ment 4-. The splined shaft 61 is slidable vwithin a huh=63 of a bevel igear- 64 journaled Within the portion 53 of the cutting-element 4 andis driven therefrom. The bevel {gear (34 is driven from the motor -52bymeans-o'f a bevel pinion 65 on a longitudinal shaft 66 in a usual manner thedetaiis'of whichfdriving merhanism are not herein shown-since they are no part of my invention.

4 he cut-ter head 55 is moved towards and away from the portion 58 and cutting.- element 4 in the guides 54 in a usual manner which herein comprises a verticallyextending screw shaft 69 pivotally mounted on a forwardly extending ear 70 by means 'of .a pin'Zl. The screwshaft 69 extends'upwardl-y from-the cutter head 55 and is threaded within the hub of a worm gear? 2 which in turn is journaled within thexportion 53of the cuttingelement 4. Th worm gear 7 2 is selectively-connectible with the motor 52 for raising :and lowering the cutter head 55 in the guides 54m a usuai manner which will not herein-beidescribed in detail since it is no :part ofmy invention.

An arcuate guide extends upwardly fromthe feeding frame 2 rearwardly of the cutting element 4 and has asgib 76 fixedto its top portion in a usual manner '(seei'lll gs. 1, 2 and 4). An arcuate groove 77 is provided in the under portion of an upwardly extending portion 78 of the pivotal frame "This arcuate groove is engaged :by the grb 76;to prevent up and down movementof t-hBIJlV- otal frame 3 with respect to the feeding frame 2. An arouate rack 79 abuts the forward portion of the arcuate guide 7 5 and is fixed to the feeding frame 2 by ineansof machine screws 80 and is engaged byiapinion-i 8l.

The pinion 8l.is provided withnnupwardly extending hub 82 journaled within the up- Wardly extending portionf? 8 of .the'pivotal frame 3. An annular ring 83-abutswtheitop portion of the upwardlyextending portion 78 of the pivotal frame 3 and :is fixedto the eupper end of the hub 82 to hold saidmhubiand pinion from vertical movement withinthe upwardly extending portion78 of the pivotal frame 3. The inner portion of-the hub-82 is splined for a portion of its length and is engaged by a splined end 84 011 121, verticalisha ft 85. A shoulder 86 is provided on the inner surface of the hub 82 to engage the lower end of the vertical shaft 85.

The vertical shaft extends upwardly from thehub 82 and is coaxial with a worm gear" 88 journaled on its huh withina-worm and worm gear housing 89. The WOIHl/filld worm gear housing 89 is fixed between support members 90 extending rearwardly-from the motor 52 of the cuttingielement 4.

Means are provided for driving the-worm gear 88 from the motor '52'which herein comprises a worm 91 integral withvazlongitudinallyextending xshaft 1:92 I journaled :wvithin the worm sand worm a :gear housing r89 sand meshing with the worm gear 88. I vilha-"l'ongitudinal .ishaift 92 a and "1W0nm1i91: sjare #drliven fromathe motor 52'bymeans of HLiIIlOtQI pinion 93' which meshes with :andxdrives a *spur gear 94'fixedonthef'forward endvofisaidflongitudinal shaft. v V v 1 iMeanaareprov-ided for-selectivelyqconnectr ing'ithe verticalshaft85Withithe wormv gear 88, which means herein comprisesmsuitiible conemzlutch ef; a usual constrnotionggcnerilly indicated; at :95,-Which clutch ris v-splined son the upper portion-of the'zve'rticalshaftfifi. islt maythus be seen ithat'whenrthe conerclutchi95 is engaged with-the worm igeart88 thei'pinion 8=1'.-is rotatediiandthe pivotal :frame' sand cutting =elementi4'iare moved about the axis of the'stud 5. i i

Thus a imeansihas been :provided for'i'mov ingvithe'rcutters bar 57 about fihGi'ifiXl-S of *zthe stud'z'5 to feedisaid cutter har-vinathe coal. iflhis provides additional means :for: feeding said cutter :bar ?-in 1 the coal and also provides; a means forrpositioningtthe"cutteri'bar 571m adjust said cuttenbar to various widthsrofirooms it'ris'desired to'cut-zand 'for permittingthenutter bar eto be :positioned' to T0116 side; or %the other *of wthe etraek aibelow r the devel :of the track. Thus when:the'rfeedingframe 2::is in anr extreme s positionion :one side; of the ibase frame:l orrtheother; :the':eutten1bar 5:7nnayt be adjusted so vasa-ttocut 1 a: narrowzroom or wide room in ;a ssinglenoperat'ion; i

The pivotah frame :isl'hel'd 'i'inifixedrz'relation withsrespcct': to fihe feedingframez'2 while the cutter ha-r 57 riszbeingifedracrosslthe face of 'ther: coal by; a: suitableiholding'eor docking meansaof a "type well known in "ath'erxart, 2a preferred fonm :aOf isaid Blocking: mean-s1 being a pin :and aperture .ilock (if a typeasgeneralfy used-on mining machines 1('not.show1r);.

Referring now. in particular to the adj ustin screw 7 and 'means for adjusting :the angular position of ":the outting..element 4 with respectito thezpivotallframe' 3, a vertical shafti96: 'lSIFPI'OVIldGa. Tilrhisishaftrpasses throughca, lug 97w-extending rearwardly -from the upwardly-extending: portion T78 of :':the pivotal: hame-'3 and has a suitable compression-spring 98 interposed. between a nut :99 and the lower portion of the lug 97. Another compression spring 100'iisi provided between thenpper portion of the lug 97 and-1a collar l01=-fi=xed.0n:ithe vertical-shaftv96. ;The upperportion of: :the vertical shaftr96' isiithrealdedwan dwis "engaged: by threads within'rtherhub of :aworm. gear 102-j ournaled within a worm and worm gear housing 103rtrunnionedsbetween-uthe outer ends of ther-supportmembers 90. The worm zgear r102 isdriven by 311163113 of a Worm 104, -'\V'hlCl1 VV1ODn1IIltyibeTOtH l5d =by suitable' hand operated meansto vanycthe: angular position of fthexcutter b ari57 with respect tot-he mine;bottomwinza usual manner.

f It should here be noted that ample clearance is provided between the vertical shaft 85 and thehub of the worm gear 88 and that to the pivotal frame 3.

' While the machine may be sumped into the coal by means of its track wheels where'the cutting is soft, I herein prefer to sump the cutter bar 57 and cutter chain 58 into the coal by means of a flexible feeding device'in a usual manner. Said flexible feeding device herein comprises a feeddrum 105 having a flexible feeding member 106 connected thereto. The feed drum 105 is fixed on a sleeve- 107 and is driven from the shaft" 17 bymeans of a worm and worm gear drive generallyindicated at 108 in a usual manner which is not herein shown in detail since it is no part of my invention. A sheave 109 is provided on each side of the feeding frame 2 near the rearward end thereof in alignment with the forward portion of the feed drum 105. Sheaves 110 are mounted rearwardly of the sheaves 109 and on each side of the feeding frame 2 and are rotatable about a horizontal transverse axis. Another pair of sheaves 111 are provided on each side of the base frame 1 beneath the feeding frame 2 and rearwardly of the front track wheels. These sheaves are rotatable about a vertical axis and the flexible feeding member 106is adapted to pass around the sheave 109, rearwardly and around the sheave 110, forwardly around one sheave 111 on the inner side thereof and around the other sheave 111 on the outer side thereof to a sheave 112 on-the outer forward corn er of the base frame 1, around said sheave to a sheave 113 in acentral portion of said base frame. Thesheaves 112 are provided on each side of the forward end of the base fame 1 so that a-flexible feeding member may be threaded around either side of said base frame. Sheaves 111a are provided on each side of the base frame 1 intermediate the sheaves 111' and 112 to provide a means for threading the flexible feeding member forwardly of the machine when the feeding frame is in an extreme position on either side of the circular rack 23. From the sheave that said member will move the cutter bar 57 and cutter chain 58 under the coal.

Referring now in particular to Figures 9 to 13, inclusive, and the use and operation of the machine embodying my vinvention, the feeding frame 2 is positioned so that the pivot 29 is in an extreme forward position in the slot 31 and so that the rearward end of said feeding frame overhangs from the opposite side of said machine. The cutter bar 57 is then positioned so that its forward end is adj acent the right hand forward corner of, the Working face when cutting from right to left to one side of the mine track. Positioning of the cutter bar is effected by moving the pivotal frame 3 about the axis of the stud 5 by means of the driving pinion 81 driven from the motor 52, which pinion meshes with the arcuate rack 79 and thus causes pivotal movement ofthe pivotal frame 3 in the manner which has hereinbefore been described. When it is desired to cut adjacent the mine bottom in front of the track, the cutter bar 57 is lowered to a position below the level of the track by means of the screw shaft 69 after it has been positioned to one side thereof by the pivotal frame 3 in a manner which has hereinbefore been described. l/Vhen the cutter bar 57 is in position to make the sumping cut, the pivotal frame 3 is locked in fixed relation with respect to the feeding frame 2 in a suitable manner. The flexible feeding member 106 is then threaded from the feed drum around the sheaves 109, 110, 111a, 112 and 113 to a jack adjacent the coal face, and the cutter chin 58 is driven about the cutter bar 57. This feeding member is then Wound on the drum 105 to move the machine along the track and sump the cutter bar 57 and cutter chain 58 into the coal. the cutter bar 57 has been sumped into the coal to the desired depth. the pivotal frame 3 is moved about its axis of pivotal connection to the feeding frame 2 so said cutter bar may 4 extend generally longitudinally with respect to said feeding frame. The pivotal frame 3 isthen looked in such a position in a suitable manner. Power is then applied to the spur gear 22 and said cutter bar 57 is moved across the coal face as is shown in Figures 11 and12 to cut a kerf having a relatively straight face. When. the cutter bar reaches the extreme left hand corner of the working face the pivotal frame 3 is unlocked from the feeding frame 2 and said pivotal frame is pivotally moved about its axis of pivotal connection to the feeding frame 2 until the cutter bar 57 is positioned so it may be withdrawn from the kerf to the opposite side of the mine track and out a relatively straight kerf as it is being withdrawn. The cutter bar 57 is then removed from the coal face by means of the flexible feeding member 106 which is attached to a jack or any other suitable holding device rearwardlyof the machine. 1

hen

It may now be seen that the initial cutting position of the cutter'bar'57 may be adjusted by means of movingthe pivotal frame'3'about theaxis 'of stud 5 so that the: machine may be adapted to cut in either wideor narrow'places so said cutter bar may be positioned to one side or the otherof the track below the level of the track adjacent the mine bottom and that a new and improved form of mining machine'is provided which is adapted to cut a kerf in the'mine wall having a straight face at the mine bottom orat various elevations with respect thereto, which machine is so arranged as to take up a minimum amount of lateral space and efficientlycut-innarrow entries. o

Vvhile I have herein shown and described one form of my invention, it will be understood that the construction and arrangement ofthe various parts may be altered without ited in the appended'claims.

' tending-forwardly from saidb'ase frame for cutting a substantially straight kerf in the mine wall at various'elevations with respect thereto. I

2'. In combinationwith afrackmounted mining machine, a base frame, a feeding frame mounted. thereon for movement in two converging slots in said base frame, a pivotal frame mounted on said'feeding frame for pivotal movement with respect thereto about a vertical axis adjacentth'e forward central portion of said feeding frame-,a-cuttingelement trunnioned on saidipivotal frame and extending forwardly therefrom including a motor and cutting mechanism forwardly of said motor including a forward portion overhanging-said base frame" and a cutter head movable toward and away from said overhanging forward portion having achain carrying cutter bar extending forwardly therefrom,

3. In combination with a track mounted" portion of said feeding frame, a cutting elemcnttrunnionedion said pivotal frame: and

a vertical axis adjacent the forward central portion of said feeding frame, a cutting element-trunnioned on 'saidpivotal frame; and 5 extending forwardly therefrom including. a motor, cutting mechanism forwardly of said: motor and driven from the forward end of said motor-including a forward portion overhanging said base frame, a cutterhead movable towards and away.fromsaidoverhang ing. forward portion having a chain carrying cutter bar extending forwardly therefrom, and means rearw'ardly ,of 'said motor and driven from th e:rearward end thereof. for movingsaid pivotalframe about its vertical axis. a I s 5. In combination with a trackmounted mining machine, a base frame, ,a feeding frame mounted thereon formovement :in two converging slots said base frame, agpivotal frame; mounted on said feeding frame. for:

pivotalmovement with resp'ect thereto about 7 avertical axis'adjacent-the forward central portion of said feeding frame, 'aacuttingelement trunnioned-on said pivotal frameand extending forwardly therefrom incl udingiai motor, cutting mechanism forwardly ofsaid motor and driven-from the forwardendof said motor including aforwardportioir overhanging said base frame,; acutter headunovable towards and away fromrsa-idoverhang ing forward iportio-n havingachaiin carrying. cutter barv extending forwardly therefrom,- an arcuate rack on said feeding, frame'rean, wardly of said motor,:andmeansdrivenfrom the rearward end of said motor. and having operative connection with said arcuaterack for moving saidpivotal frameand: cutting element about the axis of saidpivotal frame;

6. In combination with a track mounted mining machine, a base frame, a feeding frame-mounted thereon for movementin two converging slots in said base frame, a piv otal frame mounted on said feedingframe for pivotal movement with respect thereto about a vertical axis; adjacent't-he forward central portion of said feeding frame, acutting element, trunnioned on; saidpivotalframe and extending forwardly therefrom including 1 a motor, cutting" mechanism for'-- wardly of said motor and driven from the forward end of said motor including a forward portion overhanging said base frame, a cutter head movable towards and away from said overhanging forward portion having a chain carrying cutter bar extending forwardly therefrom, an arcuate rack on said feeding frame rearwardly-of'said motor, and means driven from the rearward end of said motor and having operative connection with said arcuate rack formovingsaid pivotal frame and cutting element about the pivotal axis of said pivotal frame comprising a pinion having operative connection with said arcuate rack and a vertical shaft driven by said motor and having driving connection with said pinion.

7. In combination with a truck mounted mining machine adapted to cut a kerf at the mine bottom or at various elevations with respect thereto, a base frame, a cutting 'element extending forwardly from said base frame including a motor and cutting mechanism forwardly of said motor including a forward portion overhanging said base frame, a cutter head movable towards and away from said overhanging forward portion having a chain carrying cutter bar extending forwardly therefrom, a feeding frame mounted on said base frame for movement in two converging slots in said base frame, and means for supporting said cutting element on said feeding frame for pivotal movement with respect thereto about a vertical axis comprising a pivotal frame having pivotal connection with said feeding frame.

8. In combination with a truck mounted mining machine adapted to cut a kerf at the mine bottom or at various elevations with respect thereto, a base frame, a cutting element extending forwardly from said base frame including a motor and cutting mechanism forwardly of said motor including a forward portion overhanging said base frame, a cutter head movabletowards and away from said overhanging forward portion having a chain carrying cutter bar extending forwardly therefrom, a feeding frame mountedon said base frame for movement in two converging slots in said base frame, and means for supporting said cutting element on said feeding frame for pivotal movement with respect thereto about both a horizontal and vertical axis comprising a pivotalframe having pivotal connection with said feeding frame. I

9. In combination with a truck mounted mining machine adapted to cut a kerf at the a mine bottom or at various elevations with O respect thereto, a base frame, a cutting eleing a forward portion overhanging said base frame, a cutter head movable towards and away from said overhanging forward portion having a chain carrying cutter bar ex-' tending forwardly therefrom, a. feeding frame mounted on said base frame for move M 10. In combination with a truck mounted.

mining machine adapted to cut a'kerf at the mine bottom or at various elevations with respect thereto, a base frame, a cutting element extenning forwardly from said base frame including a motor and cutting mechanism forwardly of said motor including a forward portion overhanging said. base frame, a cutter head -movable towards and away from said overhanging forward portion having a chain carrying cutter bar extending forwardly therefrom, a feeding frame mounted on said base frame for movement in two converging slots in said base frame, a trunnion support for said cutting element extend-ing forwardly of said feeding frame for supporting said cutting element for pivotal movement with respect to said feeding frame about a transverse axis, and means for supporting said trunnion support and cutting element on said feeding frame for pivotal movement with respect thereto about a vertical axis adjacent the forward end of said feeding frame comprising a pivotal frame supported on said fe g frarfiie and having pivotal connection therewit 11. In combination with a truck mounted frame mounted on said base frame for move-V ment in two converging slots in said base frame, a trunnion support for said cutting element ext-ending forwardly of said feeding frame for supporting sald cutting element for pivotal movement with respect to said feeding frame about a transverse axis, and

means for supporting said trunnion support and cutting element on said feeding frame for pivotal movement with respect thereto about a vertical axis comprising. a pivotal frame supported on said feeding frame and having-pivotal connection therewith adjacent the forward end of said feeding frame on the longitudinal center line thereof;

12. In combination with a truck mounted mining machine adapted to cut a kerfat the mine bottom or at various elevations with respect thereto, a, base frame, a cuttingelement extending forwardly from said base frame including a mot-or and cutting mechanism forwardly of said motor including a forward portion overhanging said base frame, a cutter head movabletowards and away from said overhanging forward porting element motor for moving said pivotal frame with respect to said feeding frame.

13. In combination with a truck mounted mining machine adapted to out a kerf at the mine bottom or at various elevations with respect thereto, a base frame, a cutting element extending forwardly from said base frame includingamotor and cutting mechanism forwardly of said motorincluding a forward portion overhanging said base I frame, a cutter head movabletowards and away from said overhanging forward portionhaving a. chain carrying cutter bar extending forwardly therefrom, 'a feeding frame mounted on said base frame for movement in two converging slots in said base frame, a pivotal frame supported on said feeding frame for pivotal movement with respect thereto about a vertical axis adjacent theforward end of said feeding frame,

' means for supporting said cutting element on said pivotal frame for pivotal movement with respect thereto about a horizontal axis comprising a trunnion support extending forwardly of said pivotal frame and a yieldably supported adjusting screw at the rearward end of said pivotal frame, and means driv'enby said motor for moving saidpivotal frame withrespect to said feeding frame.

14:.v In combination with a truckmounted mining machine adapted to cut a kerf at the mine bottom or atvarious elevations with respect thereto, a base frame, a cutting element extending forwardly from said'base frame including, av motor and cutting mechanism forwardly of said motor including a forward portion overhanging; said: base frame, a cutter head movable towards'and away from said overhanging forward portion having a chain carryingcutter barex tending forwardly therefrom in fixed; rela: tion} with respect thereto,- a feeding; frame mounted on said base, frame for annular movement in two converging slots insaid base frame, and means forsupporting said cutting element on said feeding frame for pivotal movement with respect thereto about a; vertical axis comprising a pivotal frame supported on saidfeeding frame and having pivotalconnection with said feeding frame adjacent the forward end thereof.

15. In combination with a truck-"mounted mining'machine adapted to cuta kerf at the minebottom or at various elevations withre: spect thereto, abase frame having a motor thereon, a cutting element extending, forwardly from said base frame including a motor and cutting mechanismv forwardly of 7 said motor includinga forWardportion-overhanging said base frame, a cutter head movable towards and away from said overhanging forward portion. having a chain. carrying cutter bar extending forwardly .there fro1n, means for driving said. cutting mechanism and: cutter chain from the forward end of said motor, a feeding frame mounted on' driven by said first mentioned motor for moving said feeding frame in said converging slots, means for supporting saidfcutti n g element on said feeding. frame for pivotal movement with. respect thereto aboutfa vertical axis. comprising, pivotal frame sup: ported on said feeding frame and: having pivotal connection with said. feeding. frame about an axis adjacent the forward end thereof andmeans driven from the rearward end of saidsecond mentionedmotor, for moving said pivotal frame about said axis.

16. In combination with a truck mount-ed mining machine adapted tocut a kerf' at the mine bottom or at various elevations with respect thereto, a base frame having a motor thereon, a cutting element extending forwardly from s'aid base frame including a motor and cutting mechanism forwardly of said motor including a forward portion overhanging said base frame, a cutter head movable towards and away from said over-' ward end of said motor, a feeding frame mounted on .said base frame for movement in two converging slots in sald base frame,

means driven by said first'mentioned motor for moving said feeding frame in said. con; verging slots, a pivotal frame supported on said feedlng frame for pivotal, movement with respect thereto about a vertical axis adjacent the forward end of said feeding frame, means for supporting said cutting element on said pivotal frame for pivotal movement with respect thereto comprising a trunnion support extending forwardly of said pivotal frame, and means driven from the rearward end of said motor for moving said pivotal frame with respect to said feeding frame.

17. In combination with a truck mounted mining machine adapted to cut a kerf at the mine bottom or at various elevations with respect thereto, a base frame having a motor thereon, a cutting element extending forwardly from said base frame including a motor and cutting, mechanism forwardly of said motor including a forward portion overhanging said base frame, a cutter head movable towards and away from said overhanging forward portion having a chain carrying cutter bar extending forwardly therefrom, means for driving said cutting mechanism and cutter chain from the forward end of said motor, a feeding frame mounted on said base frame for movement in two converging slots in said base frame, means driven by said first mentioned motor for moving said feeding frame in said converging slots,'a pivotal frame supported on said feeding frame for pivotal movement with respect thereto about a vertical axis adjacent the forward end of said feeding frame, means for supporting said cutting element on said pivotal frame for pivotal movement with respect thereto about a horizontal axis comprising a trunnion support extending forwardly of said pivotal frame and a yieldably supported adjusting screw at the rearward end of said pivotal frame, and means driven by the rearward end of said motor for moving said pivotal frame about its axis of pivotal connection to said feeding frame in all positions of adjustment of said cutting element with respect to said pivotal frame.

18. In combination with a truck mounted mining machine'adapted to cut a kerf atthe mine bottom or at various elevations with respect thereto, a base frame having a motor thereon, a cuttingelement extending forwardly from said base frame including a motor and cutting mechanism forwardly of said motor including a forward portion overhanging said base frame, a cutter head movable towards and away from said overhanging forward portion having a chain carrying cutter bar extending forwardly therefrom, means for driving said cutting mechanism and cutter chain from the forward end of said motor, a feeding frame mounted on said base frame for movement in two converging slots in said base frame, means driven by said first mentioned motor for moving said feeding frame in said concomprising a trunnion support extending forwardly of said pivotal frame and a yieldably supported adjusting screw at the rearward end of said pivotal frame, and means driven by the rearward end of said motor'for moving said pivotal frame about its axis of pivotal connection to said feeding frame in all positions of adjustment of said cutting element with respect to said pivotal frame comprising a pinion journaled in said pivotal frame meshing with an arcuate rack on'said feeding frame.

19. In combination with a truck mounted mining machine adapted to cut a kerf at the mine bottom or at various elevations with respect thereto, a base frame having a motor thereon, a cutting element extending forwardly from said'base frame including a motor and cutting mechanism forwardly of said motor including a forward portion overhanging said base frame, a cutter head movable towards and away from said overhanging forward portion having a chain carrying cutter bar extending forwardly therefrom, means for driving said cutting mechanism and cutter chain from the forward end of said motor, a feeding frame mounted on said base frame formovementin two converging slots in said base frame, means driven by said first mentioned motor for moving said feeding frame in said converging slots, a pivotal frame supported on said feeding frame for pivotal movement with respect thereto about a vertical axis adjacent the forward end of said feeding frame, means for supporting said cutting element on said pivotal frame for pivotal movement with respect thereto about a horizontal axis comprising a trunnion support extending forwardly of said pivotal frame and a. yieldably supported adjusting screw at the rearward end of said pivotal frame, and means driven by the rearward end of said motor for moving said pivotal frame about its axis of pivotal connec' tion to said feeding frame in all positions of adjustment of said cutting element with re spect to said pivotal frame comprising a pinion j ournaled in said moving frame meshing with an arcuate rack on said feeding frame, and a vertical shaft driven from said motor and having a relatively loose driving connection with said pinion so as to be angularly movable with respect thereto.

20. In combination with a truck mounted mining machine adapted to cut a kerf at the mine bottom or at various elevations with respect thereto, a base frame having a motor thereon, a cutting element extending forrace-ave Wardly from said base frame including a motor and cutting mechanism forwardly of said motor including a forward portion overhanging said base frame, a cutter head movable towards and away from said overhanging forward portion having a chain carrying cutter bar extending forwardly therefrom, means for driving said cutting mechanism and cutter chain from the forward end of said motor, a feeding frame mounted on said base frame for movement in two converging slots in said base frame, means driven by said first mentioned motor for moving said feeding rains in said converging slots, a pivotal frame supported on said feeding frame for pivotal movement with respect thereto about a vertical axis adjacent the forward end of said feeding frame, means for supporting said cutting element on said pivotal frame for pivotal movement with respect thereto about a horizontal axis comprising a trunnion support extending forwardly of said pivotal frame and a yieldably supported adjusting screw at the rearward end of said pivotal frame, and means driven by the rearward end of said motor for moving said pivotal frame about its axis of pivotal connection to said feeding frame in all positions of adjustment of said cutting element with respect to said pivotal frame comprising a pinion j ournaled in said pivotal frame meshing with an arcuate rack on said feeding frame, a vertical shaft having a relatively loose driving connection with said pinion so as to be angularly movable with respect thereto and means for selectively connecting said shaft with said motor.

21. In combination with a mimng machine, a base frame, a feeding frame mounted thereon for movement in a plurality of converging slots, a pivotal frame mounted on said feeding frame for pivotal movement with respect thereto about a vertlcal axis, and a projecting cutting element mounted on said pivotal frame for cutting a horizontal kerf in the mine wall.

22. In combination with a mining machine, a base frame, a feeding frame mounted thereon for movement in two converging slots, a pivotal frame mounted on said feeding frame for pivotal movement with respect thereto about a vertical axis, and a cutting element trunnioned on said pivotal frame having a cutter bar extending forwardly therefrom for cutting a horizontal kerf in the mine wall.

23. In combination with a mining machine, a base frame, a feeding frame mounted thereon for movement in two converging slots, a pivotal frame mounted on said feeding frame for pivotal movement with respect thereto about a vertical axis, and a projecting cutting element mounted on said pivotal frame for cutting a generally straight lie'rf in the mine wall'adj acen t the mine bottom in front ofsa'id ba'seframe;

12 i. combination with a mining ma= chine, a base frame,-a feeding frame "mount ed thereon for movement in two converging slots, a pivctaiframe mounted on said feeding frame for pivot-armament with re spect thereto about a vertical axis and 'a cut ting element trunnioned" on "i said pivotal frame having a depending cutter barextend-i mg forwardly therefrom for adding a kerf in the mine wall adjacent" the mine bottom;

- In combination with track mounted mining machine, a base frame, a feeding frame mounted thereon'for ni'ovementin two converging slots, and a projectin cutting element mounted on said feeding 'rame in= eluding a dependingfcu tter bar extending forwardly therefrom for cutting a kerfin the mine wall in front of and to each side of the mine track.

26. In combination witha track mounted mining machine, a base frame, a feeding frame mounted thereon for movement in two converging slots, a pivotal frame mounted on said feeding frame for pivotal movement with respect thereto about a vertical axis, and a projecting cutting element; mounted on said pivotal frame for cutting a hori-' zontal kerf in the mine wall.

27. In combination with a track mounted mining machine, a base frame, a feeding frame mounted thereon for movement in two converging slots, a pivotal frame mounted on said feeding frame for pivotal movement with respect thereto about a Vertical axis and a cutting element trunnioned on said pivotal frame having a cutter bar vextending forwardly therefrom for cutting a horizontal kerf in the mine wall. 7

28. In combination with a track mounted mining machine, a base frame, a feeding frame mounted thereon for movement in two converging slots, a pivotal frame mounted on said feeding frame for pivotal movement Withrespect thereto about a vertical axis, and a cutting element mounted on said pivotalframe having a chain carrying cutter bar extending forwardly therefrom for cutting a generally straight kerf in the mine wa V 29. In combination with a track mounted mining machine, a base frame, a feeding frame mounted thereon for movement in two converging slots, a pivotal frame mounted on said feeding frame for pivotal movement with respect thereto about a vertical axis, and a cutting element mounted on said pivotal frame having a chain carrying cutter bar extending forwardly therefrom for cut- I ting a generally straight kerf in the mine wall adjacent the mine bottom.

30. In combination with a track mounted mining machine, a base frame, afeeding frame mounted thereon for movement in two converging slots, a pivotal frame mounted on said feeding frame for pivotal movement with respect thereto about avertical axis and a cutting element trunnioned on said pivotal frame having a depending cutter bar extending forwardly therefrom for cutting akerf in the mine Wall adjacent the mine bottom. 7

31. In combination with a track mounted mining machine, .a base frame, a feeding frame mounted thereon for movement in two converging slots, a pivotal frame mounted on said feeding frame for pivotal movement With respect thereto about a vertical axis, and a cutting element mounted on said pivotal frame having a'chain carrying cutter bar depending therefrom and extending forwardly therefrom for cutting a generally straight kerf in the mine Wall adjacent the mine bottom.

Signed at Chicago, in the county of Cook and State of Illinois THOMAS E. PRAY. 

